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From Robert Elliot <>
Subject Re: Wrong Response returned for a Request
Date Thu, 28 Jul 2011 08:26:53 GMT
----- Original Message -----
> From: "Pid" <>
> To: "Tomcat Users List" <>
> Sent: Thursday, 28 July, 2011 9:07:13 AM
> Subject: Re: Wrong Response returned for a Request
> >>> On 27/07/2011 17:23, Robert Elliot wrote:
> >>>> We are using Tomcat 6.0.29, and occasionally experiencing
> >>>> concurrency issues
> >>>> which look very much like the wrong response is being returned
> >>>> for a request.
> >>>> While we cannot reproduce it reliably, it seems to happen when
> >>>> Keep-Alive is turned on.
> In most cases this symptom turns out to be a result of the session,
> request or response object being retained (perhaps as an instance
> field
> in a Servlet) where they should not be.
> Can you double check your code to see if this is possible?

Unfortunately it's a third party application we're running.  However as a gut feeling I'd
expect a straightforward bug like that to be easier to reproduce; we've spent a day chucking
between 100 and 1200 concurrent clients at it and we only see the problem very occasionally.
 Oddly once it has happened it keeps happening for a period - and then stops.

I think we need to think harder about how to diagnose it - at the moment we can't pin it to
a specific layer, it could be the application (most likely), Tomcat, mod_proxy or Apache HTTPD
(we're running 2.2.3). I only asked here as the bug sounded so like what we were seeing.

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